The Electronic
Geophysical Year
GFZ Representative Report
Bernd Ritschel, GFZ ISDC* Manager
rit@gfz-potsdam.de
*Information System and Data Center
CEOS Working Group on Information Systems and Services, WGISS-30, Montreal, 13 - 17 September 2010
Active Satellite Missions
Geoscience Projects
• CHAMP until 09/2010 (GFZ/DLR/CNES)
– Global Earth gravity field modeling
– Global Earth magnetic field modeling
– Weather Forecast and Space Weather
• GRACE until 2014 (GFZ/NASA/DLR)
– Global Earth gravity field
– Climate/deep ocean current monitoring
• TerraSAR-X until 2012 (GFZ/DLR/private)
– X-band radar based SAR imagery
• Tandem-X until 2015 (GFZ/DLR/private)
– 3D Digital Earth elevation model
Planned Satellite Projects
Geoscience Projects
• SWARM 2012 – 2016 (GFZ/ESA/DLR)
– Global Earth magnetic field modeling
– 3D Earth crust conductivity
– Electric currents in ionosphere
• MicroGEM (GFZ/TU Berlin/private)
– Weather Forecast and Space Weather
– Topside ionosphere tomography
• GRACE-C 2015 – 2020 (DLR/GFZ/...)
– Gravity field monitoring
• GRACE Follow-on 2020 – (NASA/CSR Texas/GFZ)
– Gravity field and water storage monitoring
GFZ ISDC* Portal Homepage: http://isdc.gfz-potsdam.de
GGP Superconducting Gravimeter Station Network
*Information System and Data Center
The 2007 International Geohazards Week, Frascati, Italy, 5-9 November 2007
ISDC Data and Users
• 289 product types from different geoscience domains
– 113 product types for public use
– 4 product types with
grants for science teams
– 180 internal product types
• 14,97 Terra Byte of data
• 24,67 Million products
• 5.000 files/day data flow
• < 2500 national and international users and user groups
•
19 data provider (scientific groups) GFZ/JPL/UCAR/CSR
CEOS Working Group on Information Systems and Services, WGISS-30, Montreal, 13 - 17 September 2010
ISDC DIF Metadata Classes
• Data Product Type = „Parent DIF Document“, Version 9.x
=> FGDC/OGC/ISO 19115 compliant (incomplete)
• Instrument (Sensor) = Instrument DIF
=> OGC SWE
• Platform (Source) = Platform DIF
=> OGC SWE
• Project (Campaign, Mission) = Project DIF
• Data Center = Data Center DIF
• Institution*
*in addition to GCMD
ISDC DIF Information Model
New Categories
• Time
• Space
• Keywords
New Attributes
ISDC Information Model
ISDC DIF Document Relations - Examples
Data, Metadata and Services
• Human readable
documents
ASCII + Textual Documents
GCMD/IDN Documents and Services
ISO 191xx Docs. + XML/XMLS
• Machine readable docs.
• OGC Web services
• Closed world
interoperability
ISDC Documents and Services*
Semantic Web + RDF/OWL
*longterm goal
• Machine readable docs.
• Open world semantic
interoperability
• Semantic Web Services
Information System Design
Entity-Relationship Modeling (ERM)
– Conceptual Schema or Semantic Data Model for the
representation of data (abstract/logical model)
– Elements: Entities, Relations, Attributes
http://en.wikipedia.org/wiki/Entity-relationship_model
CEOS Working Group on Information Systems and Services, WGISS-30, Montreal, 13 - 17 September 2010
Information System Implementation
ERM Implementation (Issue)
Relational Database
Object Oriented
–
–
–
–
–
–
–
–
–
Tables
Constraints
Relations
Stored Procedures
http://en.wikipedia.org/wiki/Relational_database
Classes
Instances
Methods
Inheritance
Encapsulation
http://en.wikipedia.org/wiki/Object-oriented_
analysis_and_design
CEOS Working Group on Information Systems and Services, WGISS-30, Montreal, 13 - 17 September 2010
Semantic Data Model
Modeling
1. Describes the meaning of
the instances and the
relations to the real world
2. Describes relations
between facts:
Object-Relation-Object
Semantic Web
Implementation
–
–
–
–
Open World Assumption
Classes
Individuals (Objects)
Properties (separated
from classes)
• Object Properties
• Data Type Properties
– Operators
http://en.wikipedia.org/wiki/Semantic_data_model
• Union
• Intersection
• Complement
CEOS Working Group on Information Systems and Services, WGISS-30, Montreal, 13 - 17 September 2010
Semantic Web Stack
• ISDC RDF
Example
http://en.wikipedia.org/wiki/Semantic_
data_model
ISDC Ontology Class Model
Controlled Vocabulary*
Free Vocabulary
Project
Platform
Institution
Instrument
c
Science Domain
Product Type
*http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html
ISDC Ontology
Classes and Properties
Domains (SuperClasses)
Properties (excerpt)*
• ISDC
• Keyword
*+inverse Properties
• Creates
• Defines
• DescribesByKeywords
GCMD controlled
content vocabulary
– Parameter
– Free Keywords
– describesByParameters
– describesByFreeKeywords
• Countries
Classes
•
•
•
•
Project
Platform
Instrument
Product Type
– Data Product
• Institution
orthogonal
•
•
•
•
Operates
Runs
Supervises
Supplies (transitiv)
– carries
– measuresDataFor
– provides
Semantic Web Stack
Properties
• Status
Classes
ISDC Ontology Model
=> Protégé Demonstration
CEOS Working Group on Information Systems and Services, WGISS-30, Montreal, 13 - 17 September 2010
Information Modeling Tasks
• Describe the content and context of data in the right
way => (standardized) metadata
– GCMD/IDN XML DIF
• Design the metadata in the right structure => concept
map/RDF-triples/ontology model
– ISDC Information Model
• Find/use the right terms for addressing the properties
of data/metadata => controlled content vocabulary
– GCMD/IDN controlled science keywords
• Open/adopt the ontology for the chance of data and
metadata interoperability => merging/alignment of
domain-centered ontologies
– Dublic Core, FOAF, …, (RDF) Linked Data
Challenges (from WGISS 24/29)
• Sustainable funding of human, technology and
technical resources for operational data and
information services
• Developing/Using of a philosophy for sustainable
data and information management at the GFZ
• Providing a high available (long-term) archive and
services for data, information and knowledge
• Education campaign for scientists related to ESSI1
• ESSI1 must become important research domain
within German geoscience work, like in many EU
countries, Japan and U.S.1 Earth and Space Science Informatics
CEOS Working Group on Information Systems and Services, WGISS-30, Montreal, 13 - 17 September 2010
Einsteinturm (1921)
Thank you, Questions?